Windows 2012 functional level

We have a single domain forest and want to raise the functional level. We have PDCE at a DC and schema master at an anther DC.
Do I have to raise domain fl at PDCE and forest FL at schema  master?
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sara2000Asked:
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Scott CSenior EngineerCommented:
Here are the steps to raise your domain and forest functional levels.

https://www.petri.com/raising-windows-server-2008-active-directory-domain-and-forest-functional-levels

In order to raise the domain functional level:

Log on the PDC Emulator of the domain with domain administrator credentials.
Note: The PDC Emulator is usually the first DC in the domain.

Open Active Directory Users and Computers by clicking Start > All Programs > Administrative Tools, and then click Active Directory Users and Computers (you can also perform this action from the Active Directory Domains and Trusts snap-in).
In the console tree, right-click the domain node and then click Raise Domain Functional Level.
 

Under Select an available domain functional level, do one of the following:
Click Windows Server 2003, and then click Raise to raise the domain functional level to Windows Server 2003.

or

Click Windows Server 2008, and then click Raise to raise the domain functional level to Windows Server 2008.

 

Read the warning message, and if you wish to perform the action, click Ok.
 

You will receive an acknowledgement message telling you that the operation was completed successfully. Click Ok.
 

You can check the function level by performing step 3 again and viewing the current function level.



In order to raise the forest functional level:

Log on to the PDC Emulator of the forest root domain with a user account that is a member of the Enterprise Administrators group.
Open Active Directory Domains and Trusts by clicking Start > All Programs > Administrative Tools, and then click Active Directory Domains and Trusts.
In the console tree, right-click Active Directory Domains and Trusts, and then click Raise Forest Functional Level.
 

Under Select an available forest functional level, do one of the following:
Click Windows Server 2003, and then click Raise to raise the forest functional level to Windows Server 2003.

or

Click Windows Server 2008, and then click Raise to raise the forest functional level to Windows Server 2008.

 

Read the warning message, and if you wish to perform the action, click Ok.
 

You will receive an acknowledgement message telling you that the operation was completed successfully. Click Ok.
 

You can check the function level by performing step 3 again and viewing the current function level.
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sara2000Author Commented:
Are we supposed to raise forest functional level at Schema master or PDCE? we have FSMO rolls are  split in to two DC.
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MaheshArchitectCommented:
domain functional levels can be raised from any writable DC in that *specific* domain as those are domain specific

forest functional level must be raised from any writable DC in *forest root domain* only

Also note that if you are atempting to raise domain functional level to 2012, you need to ensure that there is no earlier version domain controllers left in that specific domain, else operation will fail
When you update forest functional level to 2012, ensure that there are no domains having pre windows 2012 servers acting as DC, else operation will fail
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sara2000Author Commented:
We do not have pre-Windows 2012 DC. all are Windows 2012 R2 and single domain forest.
My question is that we have Schema master at a DC-B and PDCE at a DC-A.
where do we raise Domain functional lever, is it at DC-A?
Where do we raise forest functional level, is it at DC-B?
Please check this link
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc754918(v=ws.10)
It says that
You can raise the forest functional level on the schema operations master only. Active Directory Domains and Trusts automatically targets the schema operations master when you raise the forest functional level.
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MaheshArchitectCommented:
you are right, what it says, your schema master server must be online and reachable when you raise forest functional level, you can attempt forest functional level update from any writable DC in root domain as long as above condition is true

same in case of domain functional level, you can attempt DFL update from any writable DC in same domain as long as PDC of that domain is online and reachable
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sara2000Author Commented:
Should I run Domain FL at PDCE and forest FL at schema master?
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MaheshArchitectCommented:
yes you can
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Jeff GloverSr. Systems AdministratorCommented:
Mahesh answered you several times. I really does not matter which DC you raise the Domain and Forest Functional level at as long as... for the Domain, it is a Writeable DC in that domain and you are part of the Domain Admins group, and for the forest, you are on a Writeable DC in the root domain (if you have one domain, it will be the root) and your account is in the Enterprise Admins group. Make sure ALL DCs are online and your Replication is working before doing this. You upgrade the Domain first and after all domains are upgraded, upgrade the Forest level. I normally wait a day between doing the domains and the Forest to ensure all replication is up to date.
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sara2000Author Commented:
Jeff,
Thank you for the input.  We have single domain forest with Windows 2018 functional level. We have multi sites.
You mentioned wait for a day to raise the FFL.
My understanding is that replication should take place at AD-Site setting in this case 15 minutes for  us. Say i give an hour then
run dcdiag, repadmin etc. if everything is ok , then, I should be good to raise the FFL.
Why you are suggesting a day to wait? I expect expert's answer from their experience , not guessing.
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Jeff GloverSr. Systems AdministratorCommented:
Well, my network has 32 sites across the country each with at least 1 DC (main sites have multiple DCs) and we have multiple domains. I just err on the side of caution. An hour should be OK if you are not using Site links with longer replication times. Remember the 15 minute timing can vary a little. It just averages 15 minutes
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